Process of preparing paper-stock



(No Model.) 2 Sheets-Sheet 1.

T. G. GADWGAN.- PROCESS OF PREPARING PAPER STOCK Patented Ma INVENTORW/ZM ATTORNEYS E noams mans coq wqmrmo" WASHINGTON o c (No Model.) 2Sheets-Sheet 2.

I T. 0'. OAD WGAN.

PROCESS OF PREPARING PAPER STOCK. I No. 539,413. Patentd'May 21, 1895WITNESSES: I INYENITOR ATTORNEYJ UNITED STATES PATENT OFFICE.

THOMAS C. OADVVGAN, OF ANDERSON, INDIANA, ASSIGNOR OF ONE-HALF TO THE 0.S. KELLY COMPANY, OF SPRINGFIELD, OHIO. I

PROCESS OF PREPARING PAPER-STOCK.

SPECIFICATION forming part of Letters Patent N0. 539,413, dated May 21,1895.

Application filed September 11, 1894. Serial No. 522,767; (Nospecimens.)

To all whom it may concern.-

Be it known that I, THOMAS C. CADWGAN, a citizen of the United States,residing at Anderson, in the county of Madison and State of 5 Indiana,have invented certain new and useful Improvements in Processes ofPreparing Paper-Stock, of which the following is a specification. I Myinvention relates to improvements in r methods employed for preparingpaper stock; and the object of my invention is to provide a new processfor preparing paper stock in which the operation of cleaning andpreparing the stock is accomplished by means of a r series of successiveoperations to which the stock is subjected in a subdivided state; theoperation being a continuous one; the stock being by my improved processfinished up complete ready for the refining process Within the shortperiod of time necessary for it to undergo the successive operationswhich make up the process.

Briefly stated, my improved process consists, first, in partiallydisintegrating or sepaz 5 rating the stock into small quantities and in.

a continuous manner by the action of water;

second, subjecting the stock thus separated to a rubbing or churningaction in the water, and in separating the stock from the water so as todischarge the stock in the nature of pulp substantially free from water.

My process further consists in further disintegrating the stock andrewashing and reseparating it in the manner as will herein- 3 5 aftermore fully appear.

In carrying out my invention, I take the paper stock, that is, straw,rags, manila, &c., from any suitable source of supply after the same haspassed through the bleaching tanks.

0 In the condition in which it is thus found it is massed and tangledtogether and filled with lime, sand and other impurities. In thiscondition I pass it through a trough or conduit, and at suitableintervals in the passage through this trough or conduit, which ispreferably by gravity, I subject the stock to the action of waterdischarged through small discharge openings with considerable force soas to separate and partially disintegrate the stock; the stock beingretained in the trough or conduit and passing through the same bygravity for further treatment. The trough or conduit is adapted todischarge into a suitable washing and separating device, which consistspreferably of an outer casing inclosing a revolving rubber or beaterhaving suitable ribs or wipers, which operate in connection with ascreen to further disintegrate and wash the stock and separate it fromthe water in which it is contained. I then prefer- 6o ably subject thestock thus washed and partially disintegrated to the action ofdisintegrating rollers, after again mixing it with water, the operationof washing and separating being repeated to finish the product ready forthe refining engine.

In the accompanying drawings, which illustrate the devices and means forcarrying out my improved process, Figure 1 is a plan-view of a deviceadapted to carry out my invention. Figs. 2 and 3 are sectional views indetail of portions of the same. Fig. 4 is a plan view in detail of thesupporting-screen. Fig.

5 is a sectional view of the beater or rubber in detail. section, of theapparatus shown in Fig. 1.

, Like parts are represented by similar letters of reference in theseveral views.

Inthe said drawings,a represents a trough or conduit through which thestock is discharged by gravity and in which it is subjected to theaction of water discharged under pressure through suitable nozzles afrom a water pipe b. Any suitable number of the discharge nozzles a maybe employed, each being provided with a regulating valve a to controlthe quantity of water discharged through the same, and each beingpreferably provided with a nozzle 0. to direct the Water against thestock in the opposite direction from which the stock descends so that itis broken up and partially disintegrated by the action of the waterthereon. Any number of these nozzles and discharge pipes may be employedto accomplish the necessary sepa- 5 I ration of the stock. The effect ofthe water is to break upthe lumpy mass and mix it to a certain extentwith the water so that itwill flow in a continuous and substantiallyuniform steam.

mixed together are'carried into an outer cas-- ing 0, of a substantiallycylindrical shape in Fig-6 is an elevation, partly in 7 r The water andstock thus intimately Ioo cross-section but tapered in its length, theconduit (1. being adapted to discharge into the small end thereof. Inthis casing c is a revolving beater or rubber 0, having a series of ribs0 and wipers 0 The wipers c are preferably formed of leather, or otherflexible material, and are adapted to project from the taperedcylindrical rubber or beater a so as to contact with a screen a, whichconstitutes the bottom of the casing, and which is formed incross-section on the arc of a circle from the center of said rubber orbeater. The upper part of the casing 0, however, is formed eccentric tothe rubber or beater so that an enlarged space 0 is provided above therubber or beater to form a reservoir in which the stock is churned tothoroughly mix and further disintegrate the same before itis carried tothe screen and eventually discharged at the end. The revolving beaterisprovided at the enlarged end with a series of blades or paddles c, bywhich the stock is lifted and discharged through an opening 0 in theform of a pulp and separated from the water, which passes through thescreen a and out at the bottom of the casinginto asuitable dischargetrough provided for the purpose. The outer casing is provided near thelarge end with a partition 0 which extends from the top downwardly andformed to fit the revolving cone or heater; this partition being formedin the upper part of the casing only and serving to j ing the stock bythe action of Water under pressure; second, washing the stock by arubbing process in the water by which it is first treated, and thenscreening the stock from prevent the passage of the stock direct to thelifting blades or paddles c; the stock being thus retained in thewashing chamber 0 until it is gradually carried by the ribs and wipersdownwardly and along the screen, whence it is conveyed to said liftingblades or paddles; the wipers or ribs on the revolving cylinder beingformed slightly spiral for this purpose. The stock thus partlydisintegrated and washed and free from the water in which it has beentreated, is discharged through the opening 0 and passes into a suitabletrough or conduit 0 where it is again subjected to the action of astream of Water discharged from a suitable pipe or nozzle b from thewater pipe 2). The stock is carried by the action of the water and withthe same into a suitable casing, where it is subjected to the action ofa series of disintegrating rolls (Z cl (1 which are preferably ribbed orcorrugated on their outer peripheries and adapted to operate inconnection with opposing concaves e 6 6 An additional quantity of wateris supplied between each disintegrating operation through suitable pipesb b b, the stock being finally discharged through a suitable dischargeopening d into a second washing devicef, formed substantially the sameas the one previously described, except that a screen of smaller mesh ispreferably provided to prevent the disintegrated stock from passingthrough the same. From this final rubbing and washing process the stockis discharged, thoroughly prepared and washed for the refining engines.

If desired, the last process may be dis pensed with, though thisoperation will generally be found desirable after the stock isthoroughly disintegrated by the action of the rolls, as described.

It will be seen from the above description that I provide a process forfinishing paper stock which is continuous, the stock being thoroughlyprepared in a short time and in any desired quantity by varying thecapacity of the apparatus employed for carrying out the said process.The stock being subdivided is treated more uniformly than by theprocesses heretofore devised, and as each particle is brought under theinfluence of the respective operations, a most perfect system of stockpreparation is provided.

Having thus described my invention, I claim 1. The process of preparingpaper stock which consists in, first, breaking and separat the water anddischarging it substantially free from the water, substantially asspecified. 2. The process of preparing paper stock which consists infirst breaking and separat- 1 ing the stock by the action of water,rubbing and screening the stock so as to separate it from the water,then disintegrating the stock by successive grinding or tearingoperations while subjected to the action of water, and finallyseparating the stock from thewater by rubbing the same in contact With ascreen, substantially as specified.

In testimony whereof I have hereunto set my hand this Qith day of July,A. D. 1894.

THOMAS C. CADXVGAN. Witnesses:

J. A. TODD, L. H. PURsELn.

IfO

